I teleported over millions of blocks and after I did so my world just messes up
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Brother, this is borderlands, discovered back in java1.6, the principle is that maps generated too long will cause errors that will reappear in bedrock

It is actually called far lands and is caused by limitations of 32bit integer numbers. Apparently it was "fixed" (pushed back much further) in beta 1.17.20.20 - so it will likely be fixed in stable release soon.
Duplicate MCPE-11418.
The specified report has been closed as "Works As Intended" and therefore will not be fixed.