This (last?) comb is spaced at 10.2782Hz. The most intense lines of this comb are at 20.5564 Hz, 30.8346 Hz, and 41.1128 Hz which are well visible the spectrogram, as indicated in Figure 1. These 3 lines in particular appear to be modulated in amplitude, but with apparently uncorrelated phase (see Figure 1), which seems strange if they need to have a common source (... to be investigated).
Figure 2 shows the full comb, as it appears in a dark fringe high-resolution spectrum on June 20. Multiples up to 150Hz are present. Figure 3 shows the same on June 9, the comb was already present, although they were a bit reduced in amplitude. Again, looking at Figure 1, it seems that these lines got more intense on June 14 evening, which happens to be the same time when the other combs disappeared. It might just be a chance, but this fact rises the suspect that all combs are indeed related... somehow.
