Himediawrapper is set up to mark the item as watched after it's been viewed continuously for 120 seconds. Does it mark it as watched after 120 seconds or not at all?
The 120 seconds could be shortened or lengthened if people have a strong preference. I think it's about right.
It's also possible to edit the time, but it's not that easy. Install ES File Explorer and change settings so you can view hidden files. Navigate to sdcard/Android/data/org.xbmc.kodi/files/.kodi/userdata/. Edit the playercorefactory.xml file. The time marked as watched setting is at the top [playcountminimumtime]. Beware it's easy to break wrapper playback by editing this file.!