can't detect slash

[kurikabocya]

I made my own training and almost did well, except slash.
Should I put text label as // instead of / ?

144,3,265,3,265,26,144,26,0:00:00.0 <-- this is my training data "0:00:00.0"
268,3,282,3,282,26,268,26,/ <-- this is my training data "slash"
287,3,319,3,319,26,287,26,0: <-- this is my training data "0:"