yeah i get that on DNA land..on other similar ones - north-east asian :)
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My east asian is kinda weird more northeastern asian(chinese/mongolian) than siberian.
Eurogenes K13
# Population Percent
1 Baltic 29.65
2 West_Med 18.57
3 East_Med 17.17
4 North_Atlantic 16.56
5 West_Asian 12.5
6 Red_Sea 2.86
7 East_Asian 1.4
8 Oceanian 0.91
9 Siberian 0.38
Eurogenes V2 K15
# Population Percent
1 Baltic 19.55
2 West_Med 14.44
3 Eastern_Euro 14.24
4 East_Med 14.13
5 West_Asian 11.79
6 North_Sea 11.23
7 Atlantic 10.42
8 Red_Sea 2.95
9 Oceanian 0.68
10 Southeast_Asian 0.59
Here it is lower but again southeast asian something chinese like instead of siberian
Dodecad K12b
# Population Percent
1 North_European 34.44
2 Atlantic_Med 25.87
3 Caucasus 25.4
4 Southwest_Asian 7.81
5 Gedrosia 4.33
6 Southeast_Asian 1
7 Northwest_African 0.7
8 East_Asian 0.33
9 Siberian 0.12
Again southeast asian and east asian more so than siberia.
Bulgarian Siberian average is around 1.5% as far as i observed. A Thracian Bulgarian from Komotini scores 3.8%. She doesn't have any known Turkic ancestry.
mt-DNA is not like y-DNA. I mean mt-DNA doesn't have specific subclade and their spreading is weird. I mean a mt-DNA can be seen both in Nigeria, China and Germany. Also as you stated there is no enough data in yfull. It is better to evaluate it among only Bulgarians.
It is possible you have either Albanian/Greek or Vlach ancestry as different from Bulgarian. But both Albanians' and Greeks' North Atlantic not that high and not enough to make you score 26. You may want to check this.