Hi.
Combilift have a dedicated technical team to help in the UK (free). You can contact them (and any of our technical team across teh world) using the "Technical Support" contact form at the bottom of the combilift web site www.combilift.com.
Here is the direct link, https://warranty.combilift.net/technical-support-form/

Based on the details provided and if this is the change from forward mode to sideways mode, it is most likely a loose 90 degree proxy on the rear not been seen.