It's a common issue with aftermarket screens and bad adhesives.
To fix this you will need to use a combination of B7000 liquid glue and Tesa 61395 tape and let the glue cure for about 48 hours including clamping the screen down to the frame.
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Unfortunately that's how it is with aftermarket replacement screens on the Z3, bad design for holding the screen down with adhesive.
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Unfortunately that's how it is with aftermarket replacement screens on the Z3, bad design for holding the screen down with adhesive, main reason why I don't do them anymore.
It's a common issue with aftermarket screens and bad adhesives.
To fix this you will need to use a combination of B7000 liquid glue and Tesa 61395 tape and let the glue cure for about 48 hours including clamping the screen down to the frame.
Unfortunately that's how it is with aftermarket replacement screens on the Z3, bad design for holding the screen down with adhesive.