Problem with settings on Macbooks

Some of my users report problems trying to change the app settings using GarminExpress (v6.14.0) on a Macbook. The setting causing a problem is a lattitude value, that I require to be numeric and between -90 and +90

<setting propertyKey="@Properties.homeLatitude" title="@Strings.homeLatitudeTitle" prompt="@Strings.homeLatitudePrompt">
<settingConfig type="numeric" errorMessage="@Strings.homeLatitudeError" required="true" min="-90" max="90"/>
</setting>

The users get a "wrong lattitude" error when entering e.g. 51.585. This does not happen in the simulator nor with my version of GarminExpress on windows. Is this a known issue? Is there something wrong on my side? The App is EveryTile.