Hey AysonOhbata, this looks like a layout issue caused by some eras and historical entries being set in an unconventional way - either way I suggest that you migrate to the new version of Timelines since we don't offer support for this old interface anymore. The new version has better visual representation among many other improvements and you can do so by using the 3-dots on the left sidebar list of your timelines and select "Convert to Horae".
Let me know if you have any additional questions regarding the migration or if a visual issue persists after you get to the new version and we can look into it further - otherwise I will be closing this report.