Container inside repeater changing size in editor

Hello everyone and thank you for any insight you can provide.

I’ve been having a problem with repeaters on dynamic pages. For some reason if I got to resize the container in the repeater, and sometimes even if I don’t, the editor starts growing the container on it’s own and I sometimes can’t get it to stop. You can see in the image where it is growing sideways and down from where I want it (the dashed lines). Has anyone else experienced this? It doesn’t happen on my other computer so I think it may be an input issue but I’m not sure. I tried two different mice so it’s not that. It also doesn’t matter if I deselect the repeater/container, it’ll keep growing.

If anyone has any ideas I’d greatly appreciate it. Thanks.

I have a similar problem but my coontainers keep getting small! I don’t know what to do! Please help!