Subs delay after rendering

Hi,

so I've made a project with KDEnlive version 0.8.2 and then I had to edit it again in 0.8.3 and so it was imported etc. etc.
Now, when I render it, the subtitles (title clips) do no match their positions on the timeline and thus not the speech in the video. What could be the issue here?

thanks for the help!

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