Indications are that they are due to a perceived but mistaken need to claim first time buyer relief (which applies for the predecessor tax, but not to LTT).
Mae'r arwyddion yn awgrymu bod hyn o ganlyniad i gred anghywir bod angen hawlio rhyddhad prynwr am y tro cyntaf (sy'n berthnasol i'r dreth flaenorol, ond nid i'r Dreth Trafodiadau Tir).