When one of our employees enters private accommodation, only 98 NOK appears, not 1150 NOK, where only 98 is tax-free.

It seems that the setting "Only tax-free amount for private/accommodation with cooking facilities" is set to "Yes." In that case, only the tax-free rate will be paid out. Go to "System Settings --> Modules --> Travel and Expenses" and check the mentioned setting and possibly set it to "No" to resolve the issue.