Can I lock cell borders?

I have made a template for my home inspection templates that allows me to paste photos into cells, 6 on a page, with a smaller cell beneath each to add in comments. The borders are a combination of 1px and 2px lines. Sometimes I want to re-order the pictures for clarity but when I grab one and move it, it will take a 2px line with it and turn it back to 1px.

It's a little thing but it looks terrible when I export these to pdf format. Is there a way to fix the grid in place but still be able to move pics and edit the text? I tried using the "lock" function but it doesn't allow any editing.