image block not allowing to edit caption (greyed out)

Site URL: https://www.belmontaccommodates.com/

Hi there - hope someone can help me out with this. A bit new to Squarespace, so am sure it's something silly I'm not doing right. Can't seem to access the caption box for an image block - have attached a pic to show what I mean.  It appears greyed out, and won't allow me to edit it. This only seems to be a problem with inline image blocks, doesn't happen on poster or card or overlap. I do have some custom css on these images, but have tried taking that out, and still doesn't allow me to edit the caption.  Anyone got any ideas? Using Squarespace 7.1.   

Many thanks

Steve

Actually sorted this out myself. Opened it up in Safari and BOOM, it worked!  Obviously some bug in Chrome. !