sudo pacman -Syuw
[sudo] password for *****:
:: Synchronizing package databases...
:: Starting full system upgrade...
warning: manjaro-hello: local (0.7.0-6) is newer than extra (0.7.0-5)
Not sure how did this happen. How do I fix this?
sudo pacman -Syu manjaro-hello

That command is downgrading:
$ sudo pacman -Syu manjaro-hello
[sudo] password for philip:
:: Synchronizing package databases...
core is up to date
extra is up to date
community 7,0 MiB 1418 KiB/s 00:05 [####################################################################] 100%
multilib is up to date
warning: downgrading package manjaro-hello (0.7.0-6 => 0.7.0-5)
:: Starting full system upgrade...
resolving dependencies...
looking for conflicting packages...
Packages (1) manjaro-hello-0.7.0-5
Total Installed Size: 0,37 MiB
Net Upgrade Size: 0,00 MiB
:: Proceed with installation? [Y/n]
But is it not better to have the upgraded version of the file ?
0.7.0.6 must be better than 0.7.0.5 or not ?
Do you want the ‘bigger number’ or the one that matches the repositories?
0.7.0-5 is the latest version. 0.7.0-6 was pushed by mistake, I believe.
Well, that explains alot. Thanks !