Lightroom Catalog gets corrupted when I swap SSD into my other editing computer.

I have 2 identical computers with the same Lightroom running on them.

I usually work on my home computer editing wedding photos in the morning. When I need to go to the office I take my editing SSD drive with me and istall it into my other PC. This is not an external SSD but a regular secondary drive I insert into the computer and close the housing.

Every time I swap the SSD drive the Lightroom catalog gets corrupted. The backup copy works so I use that all the time but the main catalog is corrupted.

My question: Why does it create a problem that I remove the SSD and insert it into another computer? Both computers has the same processor, motherboard, etc. I make sure I completely shut down the computer before I remove the drive.

Any ideas????