The plugin is a search filter plugin by WooCommerce. I have contacted them and they said that it is the theme which is causing the display issues. I know that there may just be some compatibility issues, but we were using the 8theme filters and the results were not correct when filtering by atribute, so needed to try a different version, but now there is this issue with display.
I was hoping you might know a simple solution maybe it is just a CSS problem?
There was another issue with displaying the filters where there was a shaddow over the filter content, so you could not see or click some content, but I solved that by turning off the scroll wityhin filter in the XStore settings.
Thanks again for your help