diff -r 1909a0123c72 -r 52e10e8d88cc src/model.cpp
--- a/src/model.cpp	Tue Jun 07 21:35:29 2022 +0300
+++ b/src/model.cpp	Wed Jun 08 19:33:00 2022 +0300
@@ -111,11 +111,24 @@
 	return pointerToOptional(findInMap(this->positions, id));
 }
 
+template<typename K, typename V>
+void removeFromMap(std::map<K, V>& map, const K& key)
+{
+	const auto it = map.find(key);
+	if (it != map.end()) {
+		map.erase(it);
+	}
+}
+
 void Model::remove(int index)
 {
 	if (index >= 0 and index < this->size()) {
 		Q_EMIT this->beginRemoveRows({}, index, index);
+		removeFromMap(this->positions, this->body[index].id);
 		this->body.erase(this->body.begin() + index);
+		for (int i = index; i < this->size(); ++i) {
+			this->positions[this->body[i].id] = i;
+		}
 		Q_EMIT this->endRemoveRows();
 	}
 }