Election Integrity Issues? - San Luis Obispo County California

I have requested the SLO County Recorder's office provide the total number of ballots they sent to citizens who did not register at the address that ballot was sent to, and the total number of the blue postcard notices informing addressees to update their voter registration information or the Recorder will "automatically" register them at that address, an address they did not register at (maybe they moved out of the area, don't want to register, passed away...). Wouldn't this practice corrupt the voter rolls and election integrity? Why is this happening?

Why is the SLO County Clerk Recorder's office working with the USPS (the USPS is automatically informing the Clerk Recorder when someone puts in a change of address)? Why would a ballot get 'forwarded' by the USPS to another address which is an office, not a residence? Why did the citizen then receive a second ballot (different local election options) at her office? Why did that citizen then receive a blue postcard instructing her to return it to confirm her office address as her new voter registration address? And, that if the SLO County Recorder's office did not hear back within 15 days - they would then "AUTOMATICALLY" register her at the address (the office) printed on the postcard?

When she questioned the Clerk Recorder's office staff, why was that citizen told that she has to be registered at a residence, then a narrative switch to it is okay to be registered to vote at her office address this time and then vote from that office address (even though the citizen had not registered at her office believing this is illegal). She was also told they had no information regarding the "automatic" registration noted on the blue postcards, even arguing that the citizen was mistaken - until the citizen provided proof. They had no explanation and acted surprised.

So if I have this straight, ballots can be forwarded by the USPS (chain of custody issues?, SLO County is notified by the USPS (or DMV) that a person has changed their address and then SLO County automatically sends another ballot (even if it is a different City) to the new address, though the person did not register at that address. THEN - the person will receive notice at the forwarded address (even if it is an office, it is not a residence nor if it's an address the citizen is registered at) informing them to return the notice within 15 days and if the County did not hear back (maybe that person moved out of the area, State, passed away, no longer wants to be registered to vote...?) - that person would then be on record as now being registered to vote at the address on the notice. Also, the 2 different ballots are for different elections - the original was for Arroyo Grande, the new ballot is for Grover Beach. Is it okay for this voter to influence an election in a City where she does not live? Doesn't this corrupt our voter rolls and damage the integrity of our local elections?

Who put this procedure/practice in place? Our local SLO County Clerk Recorder, Gavin Newsom's regime, or is this a Federal mandate?

More details:
San Luis Obispo County citizen put in a change of address with the USPS to her office address as she sold her home in Arroyo Grande and is still in escrow on her new place which is in Santa Maria. She has been staying at hotels or with friends.

To her surprise, she received an Arroyo Grande ballot at her office - surprising because the USPS is not supposed to forward ballots (they are to be returned to the County Recorder). Though she did not re-register to vote when she changed her address at the Post Office, she then received a second, new ballot at her Grover Beach office, followed by the receipt of a blue postcard notifying her that if the SLO County Clerk Recorder did not hear back from her within 15 day, they would "automatically" register her at the forwarded address (the address on the blue postcard).

In my opinion, no one should ever be "automatically" registered to vote in the USA. Our elections should be held on one day, with paper ballots and valid US Citizen IDs required - no absentee ballots (unless serving in the military, not physically able) and no dictated use of electronic voting machines. Let's get back to common sense and basics to guarantee the best integrity for our most important right and duty - to VOTE and have our vote count.