Hi RevanMandalore,
Thank you for participating in the Apple Support Communities. We understand when closing a separate tab in Safari it will flash the previous page. This article has some relevant steps that may help even though they are for a different issue: If Safari isn't loading websites or quits on your iPhone, iPad, or iPod touch.
"Restart your device
Turn off your device and turn it on again.
Clear website data
You can clear website data occasionally to improve Safari performance.
- Go to Settings > Safari.
- Tap Clear History and Website Data.
- Tap Clear History and Data to confirm.
Turn on JavaScript
Turn on JavaScript if it's not already on.
- Go to Settings > Safari > Advanced.
- Find the JavaScript feature.
- Tap the button to turn on JavaScript.
Get more help
If the issue continues and only affects a certain website or webpage, check if you have Private Relay turned on. You can temporarily turn off Private Relay in iCloud Settings."
Also, the steps in this article may help as well: If Safari doesn't open a page or work as expected on your Mac.
If the issue persists, contact Apple Support for further assistance.
Take care.