iMessage Glitched on Mac

My Mac will not display some of the photos of a person and if the person has a nickname, it will display

(NAMEHERE)X-PRONUNCIATION-LAST-NAME:Check or ahitem1.X-ADDRESSING-GRAMMAR:+WhJCPAs21/JePtZFbCRti2GKNtHjLVmKzDYI3G7iPLlSIm3Hul0InGeyQI/Wbd+q83n3+2Uno9dmuyVFdW19UMOmvu00bEQjCpecp4xicJCTsaKfADS2T0nuYVSIUzOy6ca/nzPBHplpRHJ7uD1gJzzvkXZ+Ont+wjZOpFhHJnuDkq2/kdfMeA2U9cs3I9BFZ67hu1Z8q2/j/ZiR95pXsGJkdzULP6+OyhS2VMPGkGFg1D9zlou1gjUZjf91RJmdHLIiLJq/APj3022VUbxwEN19UsPSK3hCxDX3wEuu0Iqa163XE9k4pUoOvr4Ir5vNm9Pivzw4TVZWT4vAEz7Ac3qS+nOeiPNZkDk9Gh0JMBVFyVJ8X+Hes2IriBiogoIjv8Gn9SjH6i8lJjC2omeWq8XdkI=” as their nickname.

I put NAMEHERE because I am not saying their name for privacy reasons.