This sounds like what would happen if you hadn't set up the sprite sheet grid correctly.
Just in case it's that:
If you click the small "movie clip" icon next to the sprite box, you should see the grid settings, where you need to tell RahiTuber how many rows and columns are in your grid. (If it's all in a line, then it's probably just as many columns as frames, and just one row).
If not, feel free to contact me through discord where you can send me a screen recording to show me what's up!