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The 3&4 cols should be in the same v-row
and add cols="6" lg="12"
…
<v-col lg="4" cols="12" class="mb-4">
<v-row>
<v-col cols="6" lg="12" class="blue"> DIV 3 </v-col>
<v-col cols="6" lg="12" class="blue"> DIV 4 </v-col>
</v-row>
</v-col>
Source:stackexchange.com