something wrong of the WARNING: missing end time of frame and fixed

[Atom2004]

00003.track_4768.sup.zip
load the file 00003.track_4768.sup into BDSup2Sub and show the below WARNING:

===================

WARNING: missing end time of frame 58 -> fixed
WARNING: missing end time of frame 131 -> fixed
WARNING: missing end time of frame 132 -> fixed
WARNING: missing end time of frame 138 -> fixed
WARNING: missing end time of frame 208 -> fixed
WARNING: missing end time of frame 209 -> fixed
WARNING: duration of frame 213 is shorter than 520ms
WARNING: missing end time of frame 378 -> fixed
WARNING: missing end time of frame 383 -> fixed
WARNING: missing end time of frame 384 -> fixed
WARNING: missing end time of frame 385 -> fixed
WARNING: missing end time of frame 387 -> fixed
WARNING: missing end time of frame 388 -> fixed
WARNING: missing end time of frame 391 -> fixed
WARNING: missing end time of frame 392 -> fixed
WARNING: missing end time of frame 394 -> fixed
WARNING: missing end time of frame 395 -> fixed
WARNING: missing end time of frame 556 -> fixed
WARNING: missing end time of frame 847 -> fixed

Then EXPORT the subtitle file to 00003.track_4768_exp.sup.
load the video with sup file by PotPlayer.

the frame 58 of 00003.track_4768.sup below

the frame 58 of 00003.track_4768_exp.sup below