Timesheet for staff roles

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VB

Good day,
I have a problem, I want to make a shift table using gridex of janus systems in vb.net. I want to make the times not to clash with each other. I can manage deleting the clashing times of 24hrs but when going to the next day its where the problem starts e.g I have the folowing times:- 08h00 - 17h00, 17h00 - 20h00, 20h00 - 23h00, 23h00 - 02h00, 02h00 - 05h00, 05h00 - 08h00. If I enter from 17h00 - 08h00 it deletes the following times, 17h00 - 20h00, 20h00 - 23h00, 23h00 - 02h00, instead of 17h00 - 20h00, 20h00 - 23h00, 23h00 - 02h00, 02h00 - 05h00, 05h00 - 08h00 any one with a solution.

Thanks in advance