Tabcontrol designer problem

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C#

I really don't know why the size and location of controls in tabcontrol changes automatically in designer, first i thought maybe it's because of groupboxes, the i replaced the groupbox with panels, but i still have this problem in this solution and in another solution either.

here is the picture:

Picture

it seems that when i change the size of the form and close it and then reopen the form, the problem happens.

this is the designer of the form:

this.AutoScaleDimensions = new System.Drawing.SizeF(7F, 14F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(682, 412);
            this.Controls.Add(this.btnExit);
            this.Controls.Add(this.tabControl);
            this.DoubleBuffered = true;
            this.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(178)));
            this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
            this.KeyPreview = true;
            this.MinimumSize = new System.Drawing.Size(618, 450);
            this.Name = "Form1";
            this.RightToLeft = System.Windows.Forms.RightToLeft.Yes;
            this.Text = "Transfer Data";
            this.MinimumSizeChanged += new System.EventHandler(this.Form1_MinimumSizeChanged);
            this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.Form1_FormClosing);
            this.Load += new System.EventHandler(this.Form1_Load);
            this.KeyDown += new System.Windows.Forms.KeyEventHandler(this.Form1_KeyDown);
            this.Resize += new System.EventHandler(this.Form1_Resize);
            this.contextMenu.ResumeLayout(false);
            this.tabControl.ResumeLayout(false);
            this.tabPage_TransferLog.ResumeLayout(false);
            this.panel4.ResumeLayout(false);
            this.panel3.ResumeLayout(false);
            this.panel3.PerformLayout();
            this.panel2.ResumeLayout(false);
            this.panel2.PerformLayout();
            this.panel1.ResumeLayout(false);
            this.panel1.PerformLayout();
            this.tabPage_Connections.ResumeLayout(false);
            this.tabPage_Connections.PerformLayout();
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit();
            this.tabPage_Settings.ResumeLayout(false);
            this.tabPage_Settings.PerformLayout();
            ((System.ComponentModel.ISupportInitialize)(this.transferLogBindingSource)).EndInit();
            this.ResumeLayout(false);

best regards.