Hi @Dennis Lupenga, sorry to hear that you have faced this issue.
This issue is not coming from our plugin MultiVendorX. Some other plugins might be causing this issue.
Just to be sure, disable all the plugins except WooCommerce and MultiVendorX and check again.
If the issue still exists, please switch to some default theme such as Twenty Sixteen and check again.
Please do keep us posted so we can help you out.