Rosbag delay and time jump

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Hello everyone!

I ran a node that publishes images (with image_transport), laser_scan messages and a simple custom message. I recorded these 3 topics with rosbag.

During the time it was running I didn't noticed any delay or time jump in my messages. But when I play back my data with rosbag I have big time jumps and I loose a lot of data. It's not even in a buffer, it just seems the data was not recorded.

Do you know why it happens ? I know that images can be pretty demanding for ros2, can it comes from that ? (I'm working with Humble). And sorry but I don't have enough points to add my rosbag in this question.

Thanks for your help and have a nice day !