Something i'm noticing with the irish type II tree.??Hoping someone can help it make sense

If i look on FTDNA at someone that is tested as R-BY39363 It shows i am 5 Genetic steps away from them and 4 genetic steps away from?R-FT95639
to me this seems to suggest i'm in the wrong location of the tree or?R-FT95639 might not have branched from?R-BY39363
or some sort of other mutation problem lol anyways, tell how wrong i am since i dont know thanks!!

Me> R-FT43021 (delacy) 1185 A.D.?

5 steps away from R-BY39363 1330 A.D.?
4 steps away from R-FT95639 1355 A.D. ?

Thanks Dave

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it says this

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Hi,
I recently wrote to Rob Spencer, who manages the ScaledInnovation site, which incorporates the FTDNA TMRCA date ranges. ? I find the SNP Tracker tool helpful in seeing/visualizing haplogroup subclade evolutions. ? ?He points out the statistics modeling applied here and the confidence intervals around date ranges. ? ?SNP mutations need to be viewed in ranges, not absolutes. ? ?My son (Big Y) and I (CTS4466 SNP Pack 2 @111 marker panel) both see A1133 as our terminal SNP. ? ?Our O'Sullivan genetic ancestry (my grandfather adopted our Smith surname) sits below L270 and FT43021. ? ? At first my son's kit landed at FT43021 then moved a step down to A1133. ? ?As more and more Big Y results are included I'm expecting the CTS4466 data set to mature and become more refined, just as new buds and leaves emerge year after year on deciduous trees. ? I have yet to see an L270 Big Y kit show up among my matches. ? ?The array of surnames appearing on branches descendant to L270, though dominated by Sullivan/O'Sullivan, inform better understanding of various clan septs/branches, and pre-Norman and post-Norman Irish culture across Munster. ??

thanks.

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i think i found something else
on the branch labeled Guide 1185 A.D -561 15>16 (P5 Note 8)
If you follow the branch down through R-BY39363 then to?R-FT95639 there is a branch off of there that shows -561 16>15 which seems to indicate its in the wrong location or a reverse mutation does a ~300 year mutation seem right?