mrk tags inserted as part of translation in xlf files

After upgrade to Studio 2015, strange tags are inserted into xlf files. Was on 2011 and been using it for years to deal with xlf files from a large client, never any issue. After upgrade, I can still work with the files but when I zip and upload them (client procedure, not my choice to zip them) the committed strings all have extraneous tags like these:
<mrk mtype="seg" mid="6">my translated text</mrk>
<mrk mtype="seg" mid="2">my translated text</mrk>
<mrk mtype="seg" mid="1">my translated text</mrk>

Is there a way of fixing this because right now, I have to manually remove all those tags after initial commit, which is costing me a lot of time.