Hey @MP_Quadro,
I checked your header bar and the Stick Bar is not enabled. A sticky bar has a class of is-sticky
and your bar does not have that. I only see a custom class which you used to apply a background effect and maybe that is the jumping behavior you’ve mentioned.
Please inspect your bar and see if the Sticky Bar is enabled.
If it does, it’s possible that the sticky bar class I’ve mentioned is removed when by a third-party plugin or script. For that reason, please also try switching to the parent theme and try testing for a plugin conflict and temporarily move your custom scripts to a notepad. You can do this by deactivating all third-party plugins, and seeing if the problem remains. If it’s fixed, you’ll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.
Thanks.