Fixing speed in Frame to frame video player preview

When i create (everytime) a video of 5 seconds, any models,  using the frame to frame reference,  the video speed in the preview is so accelerated that looks like the video is useless. i discover today after many test, that is just the preview. so if I download the video the speed is correct. now is not a huge problem if i know but before that, i was sure video was just boken and i pay my credits for that, so not really good as feeling. thank you for your time and work, i like the platform! :I