Different support loads if connected to ground or modelled beams

Hi,

I have noticed significant difference between support loads for the same point and the same load case, but once with modelled beams and once without.
The values are as follow:
1)modelled beams: 

2)without beams. support connected to "ground"



I am trying to undestand if those values are correct. Modelling beams have really such impact like this? Someone could explain this ? or indicate any mistakes i have done ?

Thank you in advance ;)