As you can see here, in tag v0.3.1 declared version does not match resolved version, and bower reports mismatch message during installation.
bower grid-list#0.3.1 not-cached https://github.com/hootsuite/grid.git#0.3.1
bower grid-list#0.3.1 resolve https://github.com/hootsuite/grid.git#0.3.1
bower grid-list#0.3.1 checkout v0.3.1
bower grid-list#0.3.1 invalid-meta The "main" field has to contain only 1 file per filetype; found multiple .js files: ["src/gridList.js","src/jquery.gridList.js"]
bower grid-list#0.3.1 mismatch Version declared in the json (0.1.0) is different than the resolved one (0.3.1)
bower grid-list#0.3.1 resolved https://github.com/hootsuite/grid.git#0.3.1
bower grid-list#0.3.1 install grid-list#0.3.1
As you can see here, in tag v0.3.1 declared version does not match resolved version, and bower reports mismatch message during installation.