Corrupted subtitles

I backed up Amadeus movie, it comes in a double sided dvd so I ripped both sides with dvdshrink (just movie so it doesn´t need any reencoding) and then rejoined the complete movie using vobedit and ifoedit to then proceed to reencode the movie so that it could fit in a dvd-r but when I checked if the joined movie was well done before reencoding I discovered that the subtitles are all corrupted they display but are all blurry and in a different color than the original.

Got any ideas to solve this?

I need subtitles because my wife doesn´t speak english.
 
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