Problems with the fluorination of aniline-based fluoroboric acid diazonium salts during salt cleavage; what impurities are generated in fluorination-cleavage processes?

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I have been working on the diazotization of aniline derivatives with fluoroboric acids followed by salt formation and fluorine introduction, and I have a few questions for everyone. 7. After the cracking process, when performing chromatography, the main peak appears at 8 minutes; there is a 2% impurity at 15–16 minutes, and two impurities at 17–18 minutes, each accounting for 1%. There is 0.5% impurities after 19–20 minutes; after washing with sodium hydroxide, the amount of impurities decreases after 19–20 minutes, and it is likely phenol. I’m wondering whether, in 15–16 minutes, chlorine is added to form chlorinated compounds, or whether an oxygen group is added to form oxy-substituted substances The two impurities at 17-18 minutes seem to be isomers; which impurities are produced during fluorination cleavage? Thank you everyone!