Seems like on the switch side the interface was discovered initially as being 100 MBps. While later it became 1 GBps.
There are 3 ways that I know to rediscover that interface so it takes 1 GBps as correct value:
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In host configuration move interface from monitored to undecided service, apply changes, move interface back from undecided to monitored service. In this process it should keep history of the interface, but rediscover the current speed value as expected.
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Alternatively you can check box of specific interface, do actions > remove all and find new. But this removes history of interface and will find interface as a new one without history.
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Then there’s a dirty workaround if above two options fail. Change alias and / or description of interface in your switch management tool. The interface can afterwards no longer be found by Checkmk, but finds interface with changed alias and / or description as new in host configuration to be added. Afterwards you can repeat this to change alias and / or description to what it was originally. Also here you loose the history of the interface.