Depending on the type of thread, the reply is either docked at right or bottom.... 

For question the reply is docked at bottom

For other, it is docked at right 

Fix it and make all the reply on the bottom 

Reply docked at bottom: https://r1132100503382-eu1-3dswym.3dexperience.3ds.com/#community:yUw32GbYTEqKdgY7-jbZPg/iquestion:umURPRPUSF2xFp-piqVGTg

Reply docket at right: https://r1132100503382-eu1-3dswym.3dexperience.3ds.com/#community:yUw32GbYTEqKdgY7-jbZPg/post:N4k1C54hThiLOzMH6M-miQ