Has this happened to somebody??

I just went through 16 completions of trying to get character thoughts of Yale & Oliver, and for now I only have 18 thoughts. Normally, the 10 thoughts would come up at like completion 10 or 11 but it came at like completion 16, which is way too late. Whenever I did this in the past, the 10 thoughts would always show up between completion 9-11, but this whole thing is a first for me. Within 20 Secret Letters of any character, I would always have by the end of it a copy of the character or an Intron. In this case, I had 20 Secret Letters of Yale & Oliver and could only reach 22 thoughts after doing 20 completions. Has anyone experienced this before when trying to get character thoughts??