must had vs must have

Some examples from the web:

• Jan 27, 2012 ... If someone says that they had been to Florida on a recent trip, which one of the following would be a correct respone: That must had been fun.
• Feb 7, 2012 ... Maria? Was it really possible that they would meet again here, in London? It must had been 10 years since they had last talked to each other [ ...
• ... sense... the past of must may be replaced (italics added) by had to in indirect speech: His parents told him that he must/had to be in by ten that night.
• Apr 10, 2013 ... I also thought that you must had been so busy. (...) Many thanks for your help." However, a form of 'must+had+been' is a grammatical error.

Some examples from the web:

• Guy must have needed a boost.
• Life must have wanted another beautiful creature on this planet.
• That gas station must have tires.
• Glendon Hill must have contacts in South Sudan.
• The Embassy must have mistaken the names.
• It must have somehow connected with the groundwater.
• The transfiguration process must have caused her DNA to decompose.
• He must have lost everything again.
• Your babysitter must have called all her Russian friends.
• Patrick must have forgotten the thermostat.
• Somebody must have made a mistake.
• She must have triggered his emergency self-preservation function.
• Your maneuver must have crashed the flight computer.
• That artist must have lived some life.
• So his father must have what suicides are forbidden.
• Illumi must have planted this inside my head.
• A house this size must have protection.
• Your friend must have hidden talents.
• As killer must have talked to Hellstrom.
• Your grandma must have helped you.