The long standing O.G and MX feuds in J/land fuelled mostly by outside influences and made worse by CC, HSM and P/land, each supporting different fractions, HSM was backing MX were as P/land and CC were backing Madoobe.
Some form of reconciliation has happened since, but the wounds are still open, they pretty much despise Farmaajo, why specifically I don't know, I haven't seen him make any public statements about the conflict at all, just your usual fickle tribal BS and fear mongering that O.G will loose J/land if a strong MX gets in as President BS, fear mongering 101, your typical Mudug feuds.
The marehan themselves don't like faramjo because he didn't like nepotism and they hold grudges against him.