Hating the first coat of floorboard varnish, what to do?

Hi SF Community,

First time poster to the community.

Currently renovating a Victorian flat and a bit stuck with what to do after seeing the first coat of the floorboard varnish and hating it.

We've applied a birch poly floor varnish to original pine floorboards and the colours coming through are very strange - greys, purples, oranges, yellows, etc. Not the finish we're after!

Stuck between stopping there, sanding it all off, adding another coat in the hope it'll look better, or something else (wax) to mellow the colours.

Struggling to find advice online, anyone here had any similar experiences?

Cheers!