Mig21s, the Soviet premium jet, cannot be rearmed after repairs

Last night when I flew the mig21s, the Soviet premium jet with 9.7br, it couldn’t be rearmed after I dropped two fire bombs but didn’t fire anything else (including cannons). I landed on the airport and refueling is ongoing but no rearming.

Anyone has the same issue and any suggestion?

Did you turn off auto rearm?

No, everything’s on. It happened after I quit the sim game then rejoined. It worked well prior to the rejoining.