AnyCubic i3 Mega Wonky Print

Hi,

I have recelty started having issues with my prints going wonky along the x axis.
I have tried greasing the bar, slowing down the print speed, and the belt already seems very tight.

Slowing the print speed does seem to work for a couple of prints but not all.

https://i.imgur.com/v8azNP9.jpg
https://i.imgur.com/YO5ELhI.jpg

Any help would be much appreciated.

Thanks.