Hello Mr. Voss,
I really do not know where and how Oanda gets its financial information, but Bulgarian Lev has been pegged at a fixed exchange rate 1.95583 leva (levs) for one euro since 1999. Probably they (Oanda) report some fluctuations of bid/ask spreads, but this is a guess.
Hope this helps.
With regards,
Belyan Belchev, CFA, ACCA