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If that's the Power Capability element from IEEE 802.11-2016 9.4.2.15 "Power Capability element", then the minimum and maximum transmit power are signed 8-bit integers "in units of decibels relative to 1 mW", i.e. they're signed dBm. 249 is 0xF9 which, if it were correctly interpreted as a signed 8-bit value, would be -7 dBm.
If Wireshark is interpreting those fields in a Power Capability element as unsigned values, that's a bug in Wireshark; please report it on the Wireshark Bugzilla.
