I'm often facing a situation where "should + to be" form takes place. But from Grammar modal verb "should" takes a verb without particle "to". Here examples of cases:
"should + to be":
The notification should to be sent by registered mail. source
Internal dialogue to that and broader ends should to be fostered. source
"should + be":
Both were unacceptable and should be rejected.
Itinerants should be treated like all other Dutch citizens. source (pdf)
The question is what is the difference between 2 cases?