Out of 17 officially contaminated samples, 4 (!) belong to R-YP6048 (TMRCA 1500 ybp according to YFull) under R-L1029:
PCA0332 (BTW, labelled incorrectly as Ostrow Lednicki 322 by FTDNA)
PCA0333
PCA0403
PCA0496
PCA0332 (BTW, labelled incorrectly as Ostrow Lednicki 322 by FTDNA)
PCA0333
PCA0403
PCA0496