So I tried it and when I entered a tardis, where I was before just sort of melted away, does anyone know how to fix it?

Mid-melt I guess:

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If you don't want that effect, simply stop using the BetterPortals mod. This happens because of BetterPortals code, Dalek Mod can't fix that.

Know I'm 10 days late or so, but this is a effect caused by better portals to remove load screens when switching dimentions. It can be turned of inn the better portals config file