MS Project - Resource graph - double availability line per resource

[SarahvdWant]

We use MS Project to ensure that all resources have enough work and are not overloaded.
It is important to take into account the personal working hours that are entered in the calendars of the resources.
Recently, the availability line in the Resource Chart overview has changed and double lines have appeared.
As far as I can see there is no additional line set up. If you move on the set timeline of the resource graph, the double line will jump.

What could this be and where can I turn it off?

[#2]

We have the same issue 😞 I have a feeling the problem is related to the calendars but I don't know how to fix it. Any input would be highly appreciated.

[#3]

Have you found a solution? I don't have issues with functionality i.r.t. scheduling of resources, but the view of the seemingly incorrect availability line in the Resource Graph feels uncomfortable.

[#4]

@RubenMaartense I have an ongoing support case going on with Microsoft about this issue. I few days ago they wrote that the issue would be solved in the upcoming release for Microsoft Project Online Desktop Client. I asked back for the specific version number in which they expected the issue to be solved and I am awaiting an answer now.

[#5]

@Heidi_B123 I haven't received any responses besides the ones from you and Ruben... I'm really wondering if Microsoft even sees posts like this. 

[#6]

Thank you for the update. When you have more info, please post it here so we know what to expect.