Has any encountered this tab problem when creating blocks?

I’m creating tabs on my form and when I run it for a test, the tabs are all distorted. Has anyone ever encountered this problem and if so, how do you fix it? I’ve tried different settings but nothing seems to fix my problem. Thanks.

tabs_problem.PNG

It looks like it is missing images for the tabs. Have you tried to switch to a new template to see if it works? You might try that, then switch back to see if it fixes itself.