It's hard to say for sure. It might be part of a storyline where his powers are affected, or it could be a way to show a more human side of him. Sometimes these things happen in comics for unexpected and fun reasons.
Maybe he caught a cold or was exposed to some strange substance. It could be just a random plot point for humor or to create a unique situation.
The reason could be anything. Maybe it was a result of a villain's attack or some magical influence. Or perhaps it was just a light-hearted moment added to break the tension and make the story more engaging.
Chapter 583, "Making a Fool of those Big Shots!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter gives readers a real answer by opening on Days before, Jiang Li had predicted that today would bring a great...
Chapter 441, "The Taoist also Chases Stars?", is the clearest early answer because it turns Shang Shuyue's situation into a concrete plot event. Early on, She had also only learned a little trick after reading many books..
Chapter 372, "Finish the Wine and I’ll Let You Leave", is the clearest early answer because it turns Jin Si Yue's situation into a concrete plot event. The chapter gives readers a real answer by opening on Jin Si Yue suddenly realized that his wrist was back in proper...
Chapter 337, "Over Two Months Pregnant", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from He Hui's eyes widened with shock. to Let's all share the joy!" "Okay, Mrs..
Chapter 639, "Young Master Gu, Does Your Family Need a Dog?", is the clearest early answer because it turns Ji Yanbai's situation into a concrete plot event.
Chapter 598, "She Blew Up Your Family's Lake!", is the clearest early answer because it turns Miss Jiang's situation into a concrete plot event. The chapter gives readers a real answer by opening on Have you all fallen silent?] [I've fallen silent as well.] [Some say...
Chapter 493, "Affinity Only 50 Now?!", is the clearest early answer because it turns President Shang's situation into a concrete plot event. The chapter turns that into something concrete by moving from You!" Shang Shaojing was so annoyed he gritted his teeth, "Jiang Yan,...
Chapter 630, "The Secret Manual Passed Down to Sons, Not Daughters", is the clearest early answer because the hidden truth stops feeling like mere subtext. It opens with Following the command, Xiao Wu, clutching the anesthetic gun,... and closes on We should sign your dad up too." Yu Qing: ?.
Chapter 243, "How Could It Be Her?!", is the clearest early answer because it turns Flash Change's situation into a concrete plot event. It opens with Hahaha, the young master's face has gone white, but I got a scare...
Chapter 371, "Oh, Isn't This an Old Acquaintance?", is the clearest early answer because it turns Brother Yan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with #He Yun Thanks Jiang Li# #He Yun Bows# #LiHe CP# The interview wasn't...