Iteration date markers are placed incorrectly in github projects roadmap view

[tubamos]

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Description

While on the roadmap view on github projects and having set custom iteration dates, the vertical markers (and subsequently the start and finish dates of all items within each iteration) are placed incorrectly. They do not start on the date of the iteration start and they do not end at the date of the iteration date. Please see the screenshot below:

https://ibb.co/kXqKz4T

Reproduction Steps

On a github project with custom iteration interval dates, the user goes to the roadmap view and activates the markers to display the sprint / iteration dates.

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• I have read the above statement and can confirm my post is relevant to the GitHub feature areas Issues and/or Projects.