Content "shaking" when switching tabs

Hello everyone,

I’m facing an issue on my website. When I reload the page and attempt to switch tabs for the first time, the content causes the entire screen to jump or shake during the initial loading. Once I switch tabs for the first time, this bug disappears. The content has fixed heights, so I’m unsure what the issue might be. Any ideas?

Link: Loyalty system that brings clients back for more | Yotta Pay Loyalty