Men do not just have one Haplogroup. They carry a “trail” of SNPs that are cumulatively passed from fathers to their sons.
Each man has many thousands of SNPs/Variants.
As of 27 March 2024, each FTDNA Big Y-700 included 639,776 Variants for each Kit’s results. (Show All: +; – ;?)
When two Kits verify a Variants existence, the Variant becomes a named SNP.
There are 20 Haplotypes: A through T.
In your example, the Haplotype is “R”.
Haplotype + SNP = Haplogroup.
In your case, you see three Equivalent SNPs in one Box on the Block Tree: FT43614; FT283922; and FTF15721.
The three SNPs formed in 3 separate and distinct Paternal Ancestors in your Tree. The names of the SNPs differ based on when they were first observed.
“BY” SNPs were named when Big Y-500 was the current test in 2029.
“FT” SNPs began in 2020 with the introduction of Big Y-700.
Once the number of “FT” SNPs reached 469,999, the names started over at “FTA”.
When “FTA” SNPs reached 99,999 the naming began again at “FTB”.
And the system continues.
The most recent SNP included in the ISOGG SNP Index is FTG641.
As of the end of March, there were 673,791 Variants/SNPs on the FTDNA Haplotree.